Method of constructing collapsible cores.



T. MIDGL EY, s. &' T. MIDGLEY, 1R. METHOD OF CON STRUETING COLLAPSIBL E CORES.

APPLICATION FILED JULY 16. 19M.

' Patented Oct. 19,1915.

2 SHEETS-SHEET 1.

' To iilliokom z'tmay concern a s n'rnsrarmrr THOMAS MIDGLEY, sn., nnn THOMAS-MIDGLEY, 7 31,013 mammal, .oriio.

Specification of Letters Eatent.

"I'METHIQD or ooiisrno'crms .COLLAISIBLE corms.

Patented oer. i915.

' Application and July is, 1914. semi No. 851,270.

Be it known" that we, Trioiiiasi Mme-Liar,

lsn-{andl-Tiioims MIDGLEY, Jr.',' citizens of the' 'Uiiited States, residing at'lVorthington,

' inthe county of Franklin and State of Qli-io, *Ihayb ;.i'n vented certain new and usefullmfacture of these casings.

Collapsible cores themselves are used par- Y ticulaily where inextensible edged casings are made, since it is necessary that the iron core about which these casings are formed,,.

should be removed. Should the cores themselves be solid, it would be impossible to. re-

move the inextensible edged casings therefrom Withoutbreaking either the core or the casing. Therefore, it is essential that the finished core be made .up of a plurahtyxof segments readily collapsible from the annular form which they must of necessity assume when in true assembled position.

In constructing these cores in accordance with our invention, an important step resides in assembling a plurality of ring sections to form a complete ring, placing this assembled ring in a mold, and casting a core onto said sections. "In-order to avoid casting the core proper in one pieceland subsequently cutting it up into the desired number of sections, we place division members in the mold to divide the imprint. up into the desired number of sections and then cast the core by permitting the metal to flow onto the various sections.

The-step just outlined, as well'as the step outlined in the foregoing paragraph, form tWO very important features of our invention, and they may be joined to great advantage in producing these cores, but wedo not deem them inseparable and consequently our invention, contemplates the use of one .ofth'ese steps'to' 'the exclusion of the other.

or both together as may be desired and as will be apparentfrom the appended claims' It has been common practice to cast a core inonepiece, properly finish it, out it up into the various segments as desired, and then suitably face the segments ends. Vhen it was desired to again assemble the same,

clamping means of some type, usually rings,

have been resorted to. This is an expensive 1 and laborious procedure and the steps of our invention, as above outlined, aim to provide a collapsible core in much less time and at considerable less expense.

A. further important step of our-invention resides in forming the division members of conipleinental and cooperating plates, placing these plates insuperimposed relatioi with eachother iii the mold to di -v vide the imprint up into the desired number of segments and subsequently forming a connection between these division plates and the segments; by; permitting the metal: to How onto the various plates duringthe castingoperation, whereby the segments are initially cast to form a complete ring and. .are suitably faced bytlie same act.

Other important steps of our'inyentiori' reside in soforming the division plates that they will positivelybond themselves to the adjacent ends of the, core segments and also? in the peculiar inanne'r in which the plates forming the divis on members are attached to each other as a whole and to each other in two groups and in subsequently finishing thesame, all as will be more'appa'rent here inafter. I v

The various novel'features o'f'our invention will be more clearly seen after a further detailed description of' the accompanying sheets of drawings, wherein portions of a collapsible core are shown and wherein simi-' larcharacters of referencedesignate corresponding parts. I

In these drawings; Figure'l, shows approximately half of an iron core construct ed by using all the steps of our method. Fig. 21is a central vertical section through one of the division members used byus and' showing the iron core segments in! dotted outline and in true relationtherewith, Fig.

3 is a section taken on line 33 of Fig 2 through the division member only. Fig. l is a face view of a division member showing a suitable sand core baked thereonQ Fig o is a transverse section of the structure shown in Fig. 4:. and, Figs. 6, 7 and 8 aresectional views taken onlines 6-6."7'T and 88 respectively of-Fig. 1. fi In our copending. application, Serial Number 851269, filed July 16, 1914. we have specifically described a core whereinthe *di'Q vision members and sectional ring havebeeii used. In Fig.1, we have shown the upper half of a collapsible iron core, the segments --shown being denoted 1, 2 and.3. These segments. are all cast hollow and eachis. provided with an openings through which the core, sand may be withdrawn; Rigidly attached and cast in connection with'these segments, are ring-sections 5, 6 and 7, the sections 5 and 7 bein )referablv identical in structure and two sections 6 being provided to form the completed. ring. These I'lngS areal-l detachably connected together as at '8 by-a cQiSpe -ating tongue and groove cons ru tionon the meeting ends of the, various sections and vare held together by removablepins qrbolts.

l-n carrying out our method we assemble the various ring sections to form a complete ring and then bake a sand'corethereon, this sand 'core' being shown at 9 in Figs. 6, 7 and 8. It will be noted that this sand core 9 covers themaior portion of the complete ring itself, but eaves exposed its outer flange ro ection. The combined ring and. sand corefiis then. placed in a mold, allowing the uncovered portion of the ring to project into theimprint of the )reviously drawn pattern.

The iron core itse f is then cast whereupon the metal flows about the flange projection of the ring and inthis .manner attaches itself. We preferably provide a peculiar shape of flange projection to insure; this attachment in the event that, when the metal is poured, it may not be sufiicientl-y hot to bond itself thereto by fusion, although the projecting flange 'mayitself be prepared by acid ora sand blast, so that a clean free Sm face is obtainedfrom which all'oxid scale or other fore1gn matter is removed to' asslst somewhatincausing. the metal-to fuse itself thereon. The peculiarshape ofthis flange between points where the ring sections are connected together, except at the openings 4, is shown in F ig'. 6 from which it willbe ap parent that a rigid connection mustbe established.

.. Face plates are usually necessary for theabutting ends of the various core segments,

in order to avoid chipping or breaking away of four plates as 'is shown in Figs. 1 and 2,

or two to form the facing foreachend of each segment .-as is-shown in Fig 5. In'this figure, the plates 10 and 11 are provided, the plate 10 having a plain face, while the plate 11 is apertured and bulged outwardly as is shownat 152. These bulgedout portions are'confined to that portion of .the

plate which iswithin'the' normal area of the iron core,which is show-n in Fig. 4. These the plates 10 and 11, but the bulged-out por tions 16, similar tothose formedat 12, are made to extend in the opposite directlon.

These two latter plates are also rigidly atta'ched to each other within the area normally covered by the iron core and the two sets of plates then nested :and if desired, a coating of graphite 19 is placed between the two sets or some other means may be re sorted tofor preventing the two sets of plates 'from fusing together because of the generated heat in casting should this heat be of sufficient intensity. These two sets of plates, now comfortably nested are all ri idly connected together, as isshown at 1. this connection being preferably made by spot welding or riveting. and being entirely without the normal area covered bythe iron core. These nested plates forming one dirision member then have a suitable sand core baked thereon, this sa'nd core-being shown at 18 in Figs. 4- and 5, the inner outline of which conforms to the outside shape of the completed iron core. The required number ofdivision members are themplaced in the mold to divide the imprint up into the de-- sired number of segments and if it is desired to use thedetachablering sections, these division members are placed in theimprint at points adjacentthe points of \jointure of the various ring sections. The metal is then: permitted to flowinto'the various segments forming the imprint and will enter the apertured portions 12 and 16 to form a rivet head after cooling. Because of'the welded connections 13 between the two plates 10 and 11 and the plates 14: and 15, each end of the various segments will have rigidly attached thereto a plain faced facing, it"being under-, stood that the-apertured portions 12 and 16 are provided should the metal be .poured sufficiently cool that it will'not fuse itself to the metal of the facing members: will, of course, beapparent that the main pattern must he provided withsuitable core prints to accommodate the various iiilaidinetal parts carrying their sand cores. lVhen the casting is taken from the sand, that portion of. the plates forming each "division member that projects above the casting, is Chipped off flush with the'casting, taking away-with it the riveting '17- that held the four plates 10, .1'1,114-.and 15 togetheiylthe riveting 17 being preferably-- providedto avoid distortion of the plates due to heat, em, during casting.

inserted; The iron coreis now completely If the ring sections have been used in con neotion withthe'division member, the pins 1 at each joint that held the various ring sections together," are withdrawn, the holes are re-reamed' anda' hardened steel ipin again .collapsible core may be produced at a very small expense when considered with the expense of malq'ng as is at present in'us'e.

\Vhat we claim, is: i

1. The method of constructing collapsible cores which consists .in assembling a plurality of ring sections to'form a complete ring, placing said assembled sections in a mold, and casting a coreonto said sections.-

2. Rho method of constructing collapsible cores iich consists in assembling a pluralityof ri 'g sections to form acomplete ring,

placing said assembled'sections in a, mold.

placing alset of division members insaid mold in definite relation with said ring sections to-cause the core to be formed in sections, and casting a corresponding set of core segments onto said sections.

3. The method of constructing collapsible cores which consists in detachably connect-- 'ing together a plurality of ring sections to form a complete ring, placing said assem bledsections in a mold, placing a set ofseparable division members in said mold adjacent the points of joint'ure of said-ring sec tions, and casting a corresponding set of core segments onto said s'ections and onto said members. I

4. The method of constructing collapsible cores which consists in detachably connecting together a pluralityof ring sections to form a complete ring, baking ,a suitable sand core onto said. assembled sections leav ing the outer edge portions free, placing said assembled ring andsaid core in a mold, placing a set of separable division members in said mold adjacent the points of joint'ure of said ring sections and casting a corre sponding set of core segmentsonto said sec 'tions and onto saidmembers.

. 5. The'method of constructingcollapsible cores which consists in assembling a plurality of ring sections to form a complete. ring, baking a suitable. sand core onto said sections'leaving the outer edge, portions free, placing said assembled ring} and sand core in a mold, and c'astinga core onto-said sec tions: I I

6. The'method of constructing collapsible cores which consists in constructing a set of 'division'members so that each member is formed' of aplurality f plates, baking a suitable sand core -arouncl' said-division members, placing said division members and their sand cores a mold to divide the im print up into the desired sections, and then casting by permitting the metal zto flow" into the various portions of the imprint.

7'. The method of constructing collapsible cores which consists in constructing 'aset of division membersso that each member; is

formed of a plurality of plates, facing said division members in, a mold todivide the imprint into the desired sectionsi and then casting'by permitting the metal'to flow into I the-various. portions of the imprint. 8. The method of constructing collapsible cores which consists in dividing up an imprint of an annular core into the desired number of sections bythe placement in the mold of a set of division members, each member being formed of a plurality of separable plates so formed that thejmetal from one section can not flow to another section miv during the casting operation to form the coreitself into a plurality of sections.

9. The method of constructing collapsible cores which consists in dividing up an imprint of an annular core into the desired number of sections by the placement in. the

are placed in them'old, each member being formed of a plurality of separable plates so formed thatthe metal from one section cannot flow to another section during the casting operation to form the core itself into. a plurality'of sections-rigidly carrying face plates on the section ends. 1

10. The method of constructing collapsi- 'niold ofa set of division members, and pro- I 'viding each member with oppositely disposed self attaching structures before they ble cores which consists in providing 006pcrating plates to serve as divisidn. members, providing one surface of each plate formipg the division member with a self attacliing formation, superimposing-.tl1e plates: forining each division member leaving the attaching formzitions'bn the outside and placing said division members in a mold to, divide the imprint up into the desired sections, and

casting the core by permitting the'metal to flow into the various portions otthe imprint,

members.

.. to attach itself tothc plates. of said division s '11. The method,ofbonstructing eollgggi.

ble cores which consists-in forming'division members by' rigidly connecting together a groupof plates within the normal area of al}. iron core and rigidly connecting two'groups together outside of-the normal area oil-the iron core to-form a set, providing the outside plates of each "set with self attaching forma-J tions,'placing said sets in a mold to divide 112w the imprint into sections, casting thelvari ous sections onto the division members,- and removing ithat portionjof each setfof platisoutsidethe normal area ofthe iron core aft r it is cast. 7

4- 12. The method of constructing collapsible cores which consists in formingdivision members by super mposmg two plate elements to form each member; connecting the plate elements'of each member together out 1 side the normal area of an 1ron core, placing said'in mberS "a mold to divide; the imprint into "sections, casting the various sec- ;tions ontot'he outside faces ofsaid members, and removing that portion of each member Outside the normal area of the ironcore {after it is cast. f ,13.v The method of constructing collapsi-' b le cores-.whichconsists in forming division members by rigidly connecting together a group of plates'within the normal area of an-iron corewand rigidly connectin two groups together outside of the norma 'area of-the iron core to form a set, providing the outside plates of each-set withself attaching formations, bakinga. suitable sand core onto said sets outside the normal area of-an iron core, placing said sets in a-.mold to divide the imprint into sect-ions,' casting the various sections onto the division members,

and removing that portion of each set of plates outside thenormal 'area of the iron core after it is cast.

'14. .The method of constructing collapsi- I bl'e-cores which consists in assembling a plurali'ty of ring sections to form a complete ring, baking a suitable sand core onto said sections leaving theouter edge portions free, placing said'assembl'e'd ring and'sand 'corein a mold, forming division members by rigidlyconnecting together a group of plates within'the' normal area of an iron' core and rigidly connecting the two groups together outside offthe normal area of the iron core to form a set, providing the outside plates'of each se't'with self attaching formations, baking a'suitable sand core onto said sets outside the normal area -of an iron core,"plac,ing said sets-inthe mold adjacent the points of jointure of said ring sections to divide the imprint intosections casting the. various sections onto the division members and-onto the exposed portions of said ring sections,

and removing that portion of each set of. plates outside the normal area of thlI'OD 

